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I'm thinking maybe get a small HEPA filterthat runs all the time, and attach it to a large valve thing on a timer, so it filters the air in the room the rest of the time, but also exchainges the air in the terrarium 3-4 times a day.

If you are using a big Sterilite or Rubbermaid type container as grow chamber. Find yourself a timer, fish tank air pump & in line filters like below. It's simple to rig timed & filtered air exchange. Just rig an air line to go in one side (high up) & have an exit hole (low down) cover with double or triple filter disk material. Which creates a little positive pressure, inside the chamber. 15 minutes on 4 hour cycle is a good starting point. You can also use the same air pump to run a air stone bubbler, inside the chamber. 6T

aquarium air pump outside of upside down rubbermaid container pumping air into an airstone submerged in a H2O2/perlite/water bath on the inside works well for me. it think it's better upside down so CO2 can escape from the bottom.

Where could you get those?They look similar to the filters found in cars, they filter the gasoline.

I am constructing an automated system with an airpump with two outlets.Tetratec AP150 (150 l/hour)This is supposed to run air into an airstone submerged in h202 solution.A couple of holes will be drilled in the sides and stuffed with polyfill.I'll post some pics when it's complete (should be ready by wednesday, i'm lazy!)